Automatic stop device for sound-reproducing apparatus



June 15 1926.

J. C. M PHAIL AUTOMATIC STOP DEVICE FOR SOUND REPRODUCING APPARATUS 4Sheets-Shut 1 Filed June 17. 1924 June 15 1926.

J. c. M PHAIL AUTOMATIC STOP DEVICE! FOR SOUND REPRODUCING APPARATUSFiled June 17 1924 June 15 1926.-

J. C. M PHAIL AUTOMATIC STOP DEVICE FOR SOUND REPRODUCING APPARATUSFiled June 17 1924 4 Sheets-Sheet 3 June 15 1926. I J. C. M PHAILAUTOMATIC STOP DEVICE FOR SOUND REPRODUCING APPARATIJS Filed June 17,1924.

4 Sheets-Sheet 4 K14. (AKA Patented June 15, i926.

e os

rarest clerics.

JOHN C. IVIGPHAIL, OF SOUTH. \VEYMDUTE, MASlSAQE'USETTS, ASSIGNOB, TOFRANK H. THAYER, OF BGSTO'N,

MASSAGE-3i USETTS.

AUTOMATIC STOP DEVICE FGR SGUWD-REPEODUQING APPARATUS.

Application filed June 17,

This invention relates to automatic starting and stopping mechanism forsound reproducing apparatus. principal object of the invention is toprovide an effective and reliable automatic inechanisin for controllingthe movement of the motor that operates the turn table which bears therecord, such mechanism in the preferred and more comprehensiveembodiment of the invention embodying devices and connections wherebythe stopping and starting of the motor is controlled jointly and.co-operatively by the lROX GDIGIlbOf the tone arm, which bears thereproducing stylus; and the'record as it is placed upon the turntable.The foregoing and other objects and advantages of the invention willmore full appear from the following detailed description taken inconnection with the accompanying drawings, and the distinctive featuresof novelty will be pointed out in the appended claims.

llefeii'ing to the drawings:

Fi 1 is a side elevation showing the essential features of the inventionwith portions broken away, and with a part of the housing support invertical section;

Fig. 2 is it partial horizontal section on line 2-2 of Fig. 1;

Fig. 3 is a partial vertical section on line 3--3 of Fig. 1;

l ig. l is a fragmentary plan view of a pawl device Associated with thestop mechanism;

5 is a partial plan view on a relati ely smaller scale;

6 is a partial side elevation correto Fig. 5;

. is central vertical section of the table with portions broken away;

8 is a plan view of a record lifting a a member disposed centrally ofthe turn table;

H is a partial plan View of certain opera-ting connections and mountingtherefor located under the turntable;

10 is partial end view of the motor connections and brake therefor, thisbeing 11 view loot g from the left in Fig. 9; and

11 is a partial plan view showing niore particularly the brake operativeon the turn table, and the parts associated herewith.

To enable the co-operative relation of the several features to be mostreadily understood the severel parts will be described sub stantially inthe. order in which they come 1824. Serial No. 720,528.

into action in the operation of playing a record.

1 indicates a tone arm of a sound reproducing apparatus bearing a soundbox 2 equipped wi h a stylus 3. The inner end of the tone arm is mountedon pivots t to swing vertically, these pivots being borne by a swivelring 5 fitted to turn horizontally in a base ring 6 mounted upon a boardor plate 7 at the top of the housing or cabinet. All these parts may begenerally of usual or standard construction. 8 indicates the turn tablewhich bears the record, this table having, as usual, a conical socket 8which fits I upon a conical end portion 9 of a shaft or arbor 9, whichhas operating connections from a suitable spring motor 10 or otherpriine inotive means. In accordance with r v invention the turn table 8has a central dished portion 8 adapted to receive a disc plutoor ring11. This plate 11 is mounted on short studs 12, shown as three in numherwhich extend up slidably through the turn table and are borne at theirlowerends by a plate 13 beneath the turn table. Thus mounted the plate11 is normally held lightly a small distance above the surface oftheturntable 8 and adapted to be pressed down into the dished portion 8 bythe weigl'it of a record as it is rested thereon this resulting inreleasing brake device applied to the motor now to be described. Theplate 18 is engaged from underneath by spaced apart rolls 1 f borne by aforked end portion 15 of a lever bar 15. The lever 15 is providedintermediate its length with a lateral downwardly extending lug 15 whichis pivoted st 16 to the fJJZUHB'VGYlL The lever extends outwarc from.this pivotwith a counter weight 17 adjustably flXGtl to its outer endportion, this counter weight being adapted to hold the plate 11 lightlyin its upper position in readiness to be engaged and pressed down by arecord. lhe lever 15 also has intermediate its length an upwardlyextending lug 18, with which is engaged one end of a rod 19, the otherend of which is connected with an arm 20 on a vertically inountedrockshaft 21. The rockshaft 21 bears at its lower end a strap or plate22 bearing a brake surface 22 at its outer end adapted to be pressedupon a brake disc 23, which is fixed on a shaft 24 of the motor geartrain, this shaft having the usual centrifugal speed governor 25 mountedthereon. The speed governor controls the disc 23 causing it to pressmore or le s against the braking surface 26, this hour "constituting nopart of the invention. it may now be understood that as a record isplaced upon the turn table, the neight thereof will press down the plateor ri e ll and through the described connections will cause the rod 19to rock the shaft to release the brake 22 and permit the motor to start.

For automatically stopping the turn table as the playing of a record isfinished, each record is provided at a predetermined location inward ofthe grooved area thereof with a small ridge or projection 27 Thlsprojection is so located that as the record is finished it engages asmall pin or stud 28 adiustablv borne at the end of a curving arin 29.the inner end of which is fixed to one end of the shaft 30. This shaft30 1s fitted to turn in a tubular member 31 extending underneath thetone arm and borne in lugs: 32 extendingtherefrom. For purposes of thepresent description, this tubular member 31. and the lugs 32 may beconsidered merely as a journal bearing for the shaft 30 which rockstherein. The shaft 30 has fixed at its inner end a curving arm 33 andthis arm 33 has pivoted at its outer end, a series of stepped pawls 34.These pawlg 34: are adapted when the arm 33 is swung downward by therocking of the shaft? to engage a ratchet face formed on the top of aplate portion 35 borne at one end of a bent arm 35. The purpose ofhaving a plurality, shown as four of these stepped pawls is so that oneof them will always he in position to engage instantly the ratchet faceof the plate 35 upon the contacting of the record projection 27 with thestud 28. The arm 35 is pivoted inter mediate its length at 36 to acurving arm 37 of a bent lever member 37. The lever member 37 isprovided with downwardly eX- tending lugs 37. which are pivoted on a pin38 fitted in the base ring 6. The lever 37 bears at its outer extremitya brake pad 39 adapted to engage the under side of the turn table 8 tostop the same when it is permitted such engagement. The lever 37 bears aleaf spring 40 which reacts against a fixed abutment to normally pressthe braking pad 39 against the turn table. The arm 35 bears a tailportion 35' which extends underneath the lever portion 37 and is adaptedto engage the top of a short stud 41. which projects upward from thebase ring 6 and when thus engaging over the top of said stud. is adaptedto hold the brake pad 39 away from the turn table. A leaf spring 42 ismounted to act upon this tail portion 35 tending constantly to move itover the stud 41 when it is elevated enough to clear the top of saidstud. A conical stud -13 is borne by the arm 37 in position to encaagc abeveled outer edge surface of the ratchet plate 35 whereby as saidratchet plate is pressed downward the arm 35 will be rocked on its pivot36 to dislodge the tail portion 35 from the top of the stud 41. It maynow be understood that as the playing of a record is finished the ridgeor projection 27 engaging the stud 28 will rock the shaft 30 causing oneor the other of the pawls 341 to engage the ratchet plate and press thesame downward. As this occurs the outer beveled edge of said plateongaging the conical pin 43 operates to swing the arm 35 on its pivot 36to remove the tail portion 35 from the top of the stud ll and permit thearm 37 to be moved upward so as to press the brake pad 39 against theturn table under the action of the spring 40, to stop the same. Inaccordance with my invention means is provided whereby the tone arm isswung outward preliminary to playing another record, the braking deviceiust described is reset in readiness for another operation, i. e. thebrake pat 39 is moved away from the turn table and the tail piece 35relocated on top of the stud 4-1.-and by the same movement the brake 22is re-applied to the disc 23. and the plate 11 again raised to theposition shown in Figure 7 in readiness to receive another record. Forthis purpose the extremity of the bent lever arm 37 is provided with aninwardly extending inclined ledge 44: which is operatively engaged by aco-operative ledge 45 extending outwardly from the end of a curvingar1n4t6 which is pivoted at 47 to the. inner portion of the tone arm.The ledge 4-5 presents upper and lower convex faces with thin side edgesat front and rean and the arm 4.6 is equipped with a leaf spring 48 bentto press the same upward. lVith this arrangement the ledge 4:5 willengage underneath the ledge 44 to lift the arm 37 and reset the brakepad 39 awav from the turn table, as the tone arm is swung outward. butas the tone arm moves inward. in the playing of the record. the ledge4-53 will slip up over and behind the ledge 44- without operatingimpulse thereon, the arm 36 for this purpose swinging on its pivot 47.The arm 4-6 is provided intermediate its length with a lateral cam face49, and this is adapted to engage a roller 50 borne by a short arm 51secured at the upper end of a shaft 52- journalled in the base 6. Thisshaft 52 has fixed at its lower end an arm 53, the outer end of which isconnected with one end. of a rod 54. the other end of which is engagedat with the lug 18 of the lever 15. With this arrangement as the tonearm is swung outward after a record is finished and preliminary tostarting another, the first action is that the cam ledge 45, engagingthe ledge 44, moves the brake pad lit 39 away from the turn table andresets this brake device, and immediately thereafter by the continuingswinging movement of the arm, the cam face l9 engaging the roll 50operates to reapply the brake pad 2% to the brake disc 23 andsimultaneously lifts the plate 11 in readiness to receive anotherrecord, thus completing the cycle of operaticns. The ring base 6 isprovided with a cam ledge 56, upon which the tail and pivot portions ofthe arm 46 are adapted to ride as the tone arm is swung fully outward,this raising up the tone arm and holding it elevated until it is movedinward to starting position on the record, which clears this cam ledge,and permits the tone'arm to be lowcred.

The. sequence or operations having been set forth in connection with theseveral operative "features as described, will not be further repeated.It will be noted that by the co-operative relation of the two brakingdevices set forth the turn table with its motive connections is stoppedby the brake 39 as a record is finished, and as the tone arm is againswung outward, as soon as the bral: 39 is released and reset asdescribed, the motive connections are brought under the control of thebrake 22 operative on the disc 23, which is brought into action asdescribed by the engagement of the cam face 4-9 with the roll 50, andthe turn table is thus held stationary until the bralre 22 is releasedby the pressing down of the plate 11 under the weight of the record tobe played as it is deposited on the turn table. I am aware that theinvention may be embodied in other specific iorms without departing fromthe spirit or essential attributes thereof, and I therefore desire thepresent embodiment to be considered in all respects as illustrative andnot restrictive, reference being had to the appended claims rather thanto the foregoing description to indicate the scope or" the invention.

Having described my invention, what I claim as new and desire to secureby Letters Patent is:

l. The combination with the tone arm and turn table of a soundreproducing apparatus, of a brake device having connections to berendered inoperative by the weight ot a record deposited on said turntable, a second brake device equipped with connections under the control01" the tone arm to be rendered operative thereby as the playing of arecord is completed, means for resetting said second brake device as thetone arm is swung outward, and means for restoring said first brakedevice to operative position by such outward swinging of the tone arm.

2. The combination with a turn table equip i ed with motive connectionsand swingin tone arm of a sound re iroducin a" nae l P record depositedon the turn table, a second brake device equipped with connections forrendering the same operative as the record is finished, said connectionsincluding a device arranged to be rendered operative by an abutment onthe record, means for resetting and disabling said second brake deviceas the tone arm is swung outward, and means for reapplying the firstnamed brake device by such outward turning of the tone arm.

8. The combination with a turn table of a sound reproducing machine,motive connections therefor equipped with a brake, said turn tablehaving a central dished portion. and a plate normally held over saiddished portion equipped with connections for disengaging said bralre asit is depressed by the weight of a record resting. on said turn table.

4. The combination with a turn table equipped with motive connectionsand a swinging tone arm. of a brake operative on the turn table, andmeans for rendering; said brake operative as the playing of a recordfinished, said means embodying connections borne by the tone arm andequipped at the outer portion thereof with a member engageable with anabutment 0r detent on the record.

5. The combination with a turn table quipped with motive connections anda swinging tone arm, of a brake operative on the turn table, means forrendering said brake operative as the playing of record is finished,said means embodying connections borne by the tone arm and equipped atthe outer portion thereof with a member engageable with an abutment ordetent on the record. and means for resetting said brake to render thesame inoperative by the swinginp; outward of the tone arm.

6. The combination with a turn table equipped with motive connectionsand a swinging; tone arm, of a brake operative on the turn table, meansfor rendering said brare operative the playing of a recon is finished,said means embodying connections borne by the tone arm and equipped atthe outer portion thereof with a member engageable with an abutment ordetent on the record. means for resetting said brake to render the sameinoperative by the swinging' outward of the tone arm, and a second brakeequipped with means for rendering the same automatically operative bythe swinging outward of the tone arm.

In testimony whereof, I have signed my name to this specification.

JOHN C. MolHalAIL.

